﻿//The MIT License

//Copyright (c) 2009 Lluis Sanchez, Nick Darnell

//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in
//all copies or substantial portions of the Software.

//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//THE SOFTWARE.

using System;
using System.Reflection;
using System.Reflection.Emit;

namespace Polymorph
{
    /// <summary>
    /// The <see cref="MethodInfoEx"/> extension method class makes it simpler to
    /// extract additional information from <see cref="MethodInfo"/>.
    /// </summary>
    public static class MethodInfoEx
    {
        public static bool CompareSigniture(MethodInfo method, MethodInfo other)
        {
            ParameterInfo[] myParams = method.GetParameters();
            ParameterInfo[] otherParams = other.GetParameters();

            if (myParams.Length != otherParams.Length)
                return false;

            if (method.ReturnType != other.ReturnType)
                return false;

            for (int i = 0; i < myParams.Length; i++)
            {
                if (!myParams[i].ParameterType.Equals(otherParams[i].ParameterType))
                    return false;
            }

            return true;
        }

        public static bool CompareSigniture(MethodInfo method, Type[] paramTypes, 
            Type returnType)
        {
            ParameterInfo[] parameters = method.GetParameters();

            if (parameters.Length != paramTypes.Length)
                return false;

            if (method.ReturnType != returnType)
                return false;

            for (int i = 0; i < parameters.Length; i++)
            {
                if (!parameters[i].ParameterType.Equals(paramTypes[i]))
                    return false;
            }

            return true;
        }

        public static Type[] GetParameterTypes(MethodInfo method)
        {
            return ExtractParameterTypes(method.GetParameters());
        }

        private static Type[] ExtractParameterTypes(ParameterInfo[] parameters)
        {
            Type[] ts = new Type[parameters.Length];

            for (int n = 0; n < ts.Length; n++)
                ts[n] = parameters[n].ParameterType;

            return ts;
        }
    }
}